Ruby : Using "send" version, designed for testing

send usage may cause undesired access to private (protected) fields of the class.

Notes:

• besides testing private fields, send (__send__) commonly used for dynamically generated class fields and methods;
• even if your application forces the user to choose from fixed alternatives inside the UI, it’s not going to save you from editing of the request;
• you can redefine send as your function, then you can access built-in method through __send__.